Work-drive for grinding-machines



J. N. HEALD AND A. M. DRAKE.

WORK DRIVE FOR GRINDING MACHINES.

APPLICATION FILED MAYI5, I919.

1,361 ,854, I Patented Dec. 14, 1920.

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J. N. HEAID AND A. M. DRAKE. WORK vDRIVE FOB GRINDING MACHINES.

APPLICATION FILED MAY 15, I919.

Patented Dec. 14, 1920.

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J. N. HEALD AND A. M. DRAKE.

WORK DRIVE FOR GRINDING MACHINES.

APPLICATION FILED MAY 15, 1919. 1 ,361,854 Patented Dec. 14, 1920.

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UNITED STATES PATENT OFFICE.

JAMES HEALD AND ALDEN M. DRAKE, OF WORCESTER, MASSACHUSETTS,

ASSIGNORS T HEALD MACHINE COMPANY, A CORPORATION OF MASSACHU- SETTS.

WORK-DRIVE FOR GRINDING-MACHINES.

Specification of Letters Patent.

Patented Dec. 14,1920.

Application filed May 15, 1919. Serial No. 297,850.

To all whom it may concern:

Be it known that we, JAMES N. HEAL!) and ALDEN M. DRAKE, citizens of the United States, both residing at'Worcester, in the county of Worcester, and State of Massachusetts, have invented a new and useful Work- Drive for Grinding-Machines, of which the following is a specification.

This invention relates to a grinding machine, and more particularly to improved mechanism for rotating the work support or table in such a' machine. Such tables are commonly mounted on a substantially vertical spindle, which is adjustable axiall and which also has a limited angular a justment about a transversely disposed axis. The problem of driving such a work spindle smoothly and easily in all of its different.

the driving shaft, the gear on the spindle being preferably elongated to permit axial adjustment of the spindle. Another feature of our invention relates to an improved mechanism by which the work support may be adjusted axially.

Our invention also relates to arrangements and combinations of parts which will be hereinafter described, and more particularly pointed out in the appended claims.

A preferred form of our invention is shown in the drawing, in which- Figure 1 is a side elevation of our improved work drive;

Fig. 2 is a sectional front elevation along the line 2--2 of Fig. 1, and

Figs. 3 and 4 are sectional plan views taken along the lines 3-3 and 4-4 of Fig.

Referring to the drawings, we have shown a grinding machine having a frame in which a driving shaft 11 3) is firmly supported in a bearing 12. pulley 13 1s I secured to one end of the shaft 11 and a spiral gear 14 is secured to the opposite end of said shaft. A casing 15 is mounted to swing about the axis of the shaft 11, one portion of the casing swinging upon the extending hub of the bearing 12, and another portion of the casing being pivoted upon a stud 16 alined with the shaft 11. The stud extends through an ear 17 of the frame 10 and is secured therein by a nut 18.

A non-rotatable sleeve 20 is slidably mounted in thecasing 15 but is prevented from angular movement therein by a key 21, (Fig. 2). A bracket 22 projects at one side from the lower end of the sleeve 20 and receives a feed screw 23 rotatable in a bearin'g'24 in the casing 15. A pair of bevel gears 25 and 26 connect the screw 23 with a short horizontal shaft 27 having a bearing in the casing 15. A hand wheel 28 on the outer end of the shaft constitutes means by which the feed screw may be actuated to verticall adjust the sleeve 20. A graduated dis 29 and index 30 are provided for accurate adjustments.

The sleeve 20 has upper and lower bearings for the work su porting spindle, the upper bearing prefera ly being an enlarged conical thrust hearing, as shown at 31 1n Fig. 2,. and the lower bearing 32 being tapered and being axially ad ustable relatively. to the sleeve 20 by adjusting screws 33 and 34. A work support 36 is secured to theupper end of the spindle and may be of any desired form, the support here n shown being in the form of a magnetlc chuck.

An elongated spiral gear 37 1s secured to the spindle 35 by a nut 38 and is in continuand engaging a nut 42 having a swivel connection to the frame 10. A binding screw 45 extends through a slot 43 (Fig. 1) 1n the frame 10 and is threaded into a rearwardly' projecting lug 44 on the casing 15, and is thus efiective to holdthe work supporting spindle in any desired angular position.

Having described the details of construction of our improved grinding machine, it will be seen that we have provided a work supporting spindle both axially and angularly adjustable, together with a positive spiral gear drive for said spindle in every adjusted position thereof, and that we have also provided suitable mechanism for adjusting the spindle both axially and angularly. Through this spiral gear connection an exceptionally even and steady motion of rotation is communicated to the spindle and to the work supported thereby.

Having thus described our invention it will be evident that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope thereof as set forth in the claims, and we do not wish to be otherwise limited to the details herein disclosed, but what we claim is 1. In a grinding'machine, in combination, a work supporting spindle, a drivin shaft extending transverse y adjacentv sai spindle, said spindle bein angularly adjustable about the axis of sai driving shaft, means to adjust said spindle axially, and a air of spiral gears mounted on said spin 1e and said shaft respectively, said gears directly engaging to rotate said spindle positively in every position thereof.

2. In a grinding machine, in combination,

a work supporting spindle, a drivin shaft extending transverse y' adjacent sai spindle, saidspindle bein angularly adjustable about the axis of sai driving shaft, means to adjust said spindle axially, a spiral gear on said shaft, and an elongated spiral gear on said spindle engaged and rotated by said first mentioned gear in every adjusted position of said spindle.

3. In a tion, a wori elongated spiral sleeve having bearings for said spindle and having an elongated opening adjacent said gear, a driving shaft having a spiral gear thereon engaging said first mentioned gear through said opening, a casing in which said sleeveis slidable but non-rotatable, means to adjust said sleeve axially, and means to adjust said casing angularly about the axis of said driving shaft.

4. In-a grinding machine, a work supporting spindle, means to rotate said spindle, a non-rotatable sleeve in which said spindle is supported, said sleeve having a threaded bracket secured thereto, a caslng for said sleeve, and a feed screw supported in hearings on said casing,'parallel to said spindle and engaging said threaded bracket for adjusting said sleeve and spindle axially in said casing. 7

In testimony whereof we have hereunto afiixed our signatures.

JAMES N. HEALD. ALDEN M. DRAKE.

supporting spindle having an inding machine, in combina-v ear secured thereto, a a 

